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Space stacking light beam distributed phase delayer and speckle elimination method thereof

A phase retarder, stacking technology, applied in optics, instruments, optical components, etc., can solve the problems of high manufacturing cost and large structure, and achieve the effects of low cost, simple device structure and convenient assembly.

Inactive Publication Date: 2017-05-10
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a space-stacked beam distributed phase retarder and its speckle elimination method, and solve the technical problems of the existing device for suppressing laser speckle with huge structure and high manufacturing cost

Method used

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  • Space stacking light beam distributed phase delayer and speckle elimination method thereof
  • Space stacking light beam distributed phase delayer and speckle elimination method thereof
  • Space stacking light beam distributed phase delayer and speckle elimination method thereof

Examples

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Embodiment 1

[0018] Such as figure 1 , 2 As shown, a two-dimensional space-stacked beam distributed phase retarder, wherein: the space-stacked beam distributed phase retarder is a polymer micro-processing element. Taking the SU8 photoresist micromachining element as an example, its structure is: an m×n matrix composed of SU8 photoresist micromachining elements with a certain height difference (see figure 1 ), m=n=4 in this embodiment, the polymer microprocessing element itself is a two-dimensional phase modulator, which can directly realize phase modulation in two-dimensional spatial distribution. The described two-dimensional polymer microfabricated element repeats 2 * 2 times speckle elimination device (see figure 2 ), into an 8×8 matrix.

[0019] A speckle elimination method using a two-dimensional space stacked beam distributed phase retarder, the steps of which are: expand the laser beam emitted by the laser light source, and pass through the 4×4 polymer micro-processing component...

Embodiment 2

[0022] Such as image 3 , 4 As shown, a one-dimensional space-stacked beam distributed phase retarder, wherein: the space-stacked beam distributed phase retarder is a plurality of machined light-transmitting elements whose refractive index is not equal to the refractive index of air, Its structure is: machined light-transmitting elements with a certain height difference and a refractive index not equal to the refractive index of air are bonded together.

[0023] The machined light-transmitting element is, for example, glass. It consists of a glass layer 1 and a glass base 2 with a certain height difference (see image 3 ), the present embodiment is 4 layers. The length of each layer is a, the width is b, and a=4b is taken here, and then the one-dimensional machined light-transmitting elements are superimposed and assembled (see Figure 4 ), so as to realize the phase modulation of two-dimensional spatial distribution.

[0024] A speckle elimination method using a one-dime...

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Abstract

The present invention relates to a space stacking light beam distributed phase delayer and a speckle elimination method thereof, and relates to the light beam regulation and control dissipated speckle technology. The problems are solved that the structure of the current device of inhibiting laser speckles is large, and the manufacturing cost is high. Polymer micromachining elements or machining transmitting elements are employed, the structure of each polymer micromachining element is an m*n matrix formed by the polymer micromachining element having a certain height difference; the structure of each machining transmitting element is formed by assembling the machining transmitting elements having a certain height difference and having the refractive index being not equal to the air refractive index; the height difference of the polymer micromachining elements or the machining transmitting elements is randomly arranged and satisfies that the optical path difference is larger than or equal to the coherent length LC and the laser coherence is destroyed in the time; and the arrangement of the number of the elements, the length and the arrangement mode is that: a single-beam laser is divided into a plurality of non-coherent illumination light sources, and satisfies that the areas of the non-coherent illumination light sources are larger than or equal to the coherent area AC, and the laser coherence is destroyed in the space.

Description

technical field [0001] The invention belongs to the technical field of light beam control and speckle elimination, and is especially used for laser projection and laser illumination; in particular, it relates to a spatially stacked beam distributed phase retarder and a speckle elimination method thereof. Background technique [0002] When a coherent laser beam hits the surface of a rough object, light wave interference occurs between the light reflected or transmitted by the rough surface. What is shown is the granular point with uneven light intensity distribution, which is called speckle. In laser displays, the presence of speckle degrades image quality and must be suppressed. [0003] At present, limited by the optical power of laser diodes, fiber-optic coupling is generally used in high-lumen laser displays to integrate multiple collimated red, green, and blue laser diodes through optical fiber bundles to achieve high-power light source illumination. CN10477626A disclo...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B27/48
CPCG02B5/3083G02B27/48
Inventor 仝召民程文治陈旭远肖连团贾锁堂
Owner SHANXI UNIV
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